Cooking utensil with magnetic conductive coating and preparation method thereof

Abstract

The present invention relates to a method for preparing cooking utensils with a magnetic conductive coating, comprising the following steps: S1: uniformly dispersing magnetic conductive metal particles in a solvent to obtain a suspension; then adding vinyl ferrocene, acrylate, and an epoxy olefin compound, and then adding an initiator, and reacting in an inert atmosphere to obtain a core-shell magnetic conductive material having a core layer of magnetic conductive metal particles and a shell layer of a ferrocene olefin copolymer; S2: atomizing and spraying the suspension onto the outer surface of a pretreated aluminum pot body; baking the sprayed core-shell magnetic conductive material at a certain temperature to form a magnetic conductive layer on the outer surface of the pot body; and S3: attaching a ceramic glaze layer to the magnetic conductive layer to obtain the cooking utensils with the magnetic conductive coating. The cooking utensils with the magnetic conductive coating of the present invention solve the problem that existing aluminum pot cooking utensils have no magnetic conductivity or poor magnetic conductivity, and meet the long-term magnetic conductive use requirements of the cooking utensils.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking utensils, and in particular to a cooking utensil with a magnetic conductive functional coating and a preparation method thereof. Background Art

[0002] With technological advancements and the continuous improvement of people's quality of life, the heating sources of cooking utensils have undergone significant changes, from direct open flame heating to non-open flame heating methods, thereby providing a safer and more flexible cooking experience for users in different occasions. Non-open flame cooking utensils such as induction cookers, electric pressure cookers, and rice cooker inner pots are made of aluminum, which is low-cost but lacks magnetic conductivity and cannot be heated by electromagnetic induction. Typically, a metal sheet is added to the outer surface of the bottom of the pot to provide magnetic conductivity, but the overall magnetic conductivity of the pot is poor. Summary of the Invention

[0003] In view of the above shortcomings of the existing technology, the present invention provides, on the one hand, a method for preparing cooking utensils with a magnetic conductive coating to solve the problem that existing cooking utensils with aluminum pot bodies have no magnetic conductivity or poor magnetic conductivity, so as to meet the long-term magnetic conductivity requirements of cooking utensils.

[0004] In order to achieve the above objects, the technical solution adopted by the present invention is:

[0005] A method for preparing cooking utensils with a magnetic conductive functional coating, the method comprising the following steps:

[0006] S1: Magnetic metal particles are uniformly dispersed in a solvent to obtain a suspension; vinyl ferrocene, acrylate, and epoxy olefin compound are then added, followed by an initiator, and the mixture is stirred with ultrasonic assistance in an inert atmosphere at 30-50°C for 6-12 hours to obtain a core-shell magnetic conductive material having a core layer of magnetic metal particles and a shell layer of ferrocene-olefin copolymer. The shell layer of the core-shell magnetic conductive material of the present invention is made of vinyl ferrocene, acrylate, and epoxy olefin compound as raw materials, and a ferrocene-olefin copolymer having both ferrocene functional groups and epoxy groups is obtained by copolymerization. This copolymer has a magnetic effect, which synergizes with the magnetic metal particles to improve the magnetic properties of cooking utensils. The core-shell magnetic conductive material of the present invention, on the one hand, because the organic material is coated on the outer surface of the magnetic metal particles, the magnetic metal particles are more easily dispersed uniformly on the surface of the aluminum pot body by atomization spraying, and the epoxy group improves the bonding strength between the magnetic metal particles and the pot body. On the other hand, the ferrocene functional groups play a synergistic magnetic role, further improving the magnetic properties of the cooking utensils. The ferrocene-olefin copolymer of the present invention further improves the compactness of the core-shell magnetic conductive material due to the addition of acrylic acid ester, thereby promoting the improvement of the magnetic conductive performance of cooking utensils.

[0007] S2: spraying the core-shell magnetic conductive material obtained in step S1 onto the outer surface of the pretreated aluminum pot; baking the sprayed core-shell magnetic conductive material at a temperature of 90-120° C. for 5-30 minutes to form a magnetic conductive layer on the outer surface of the pot; the spraying is performed at an atomizing pressure of 0.1-0.8 MPa;

[0008] S3: A ceramic glaze layer is attached to the magnetic conductive layer obtained in step S2 to obtain the cooking utensil with the magnetic conductive functional coating.

[0009] Furthermore, the magnetic conductive metal particles are selected from at least one of iron powder, iron-carbon alloy, iron-manganese alloy, iron-silicon alloy, iron-aluminum alloy, and iron-nickel alloy.

[0010] Furthermore, the acrylate is a composition of methyl acrylate and fluorine-containing acrylate.

[0011] Furthermore, the fluorine-containing acrylate is at least one of trifluoroethyl methacrylate, trifluoroethyl acrylate, and trifluoromethyl methacrylate. Furthermore, due to the fluorine-containing functional groups of the fluorine-containing acrylate, the hydrophobicity and corrosion resistance of the magnetic conductive layer are improved.

[0012] Furthermore, the epoxy olefin compound is at least one of 2,3-epoxypropyl acrylate, 1,2-epoxy-5-hexene, 4-(2-oxiranylmethoxy)butyl acrylate, and oxiran-2-yl methyl methacrylate. The epoxy olefin compound of the present invention has an epoxy group and an acrylate at either end of its molecular structure. The acrylate functional group can participate in the addition reaction of the olefin to produce a ferrocene-olefin copolymer. The epoxy group improves the bonding strength between the magnetic metal particles and the pot body during the treatment process in step S2.

[0013] Furthermore, the initiator is at least one of diisopropyl peroxydicarbonate, diethylhexyl peroxydicarbonate, azobisisobutyronitrile, and azobisisoheptylonitrile.

[0014] Furthermore, the molar ratio of the vinyl ferrocene, the acrylate and the epoxy olefin compound is 1 to 2:2 to 5:1.

[0015] Furthermore, the mass ratio of the magnetic conductive metal particles to vinylferrocene is 3 to 5:1.

[0016] Furthermore, the pretreatment method of the pot body is: placing the aluminum pot body into a sandblasting machine, using silicon carbide ceramics as shot blasting, and performing sandblasting roughening treatment to form an uneven raised structure on the outer surface of the bottom of the pot body, and then degreasing and cleaning it for standby use.

[0017] Furthermore, the thickness of the magnetic conductive layer is 40 to 100 microns, and the thickness of the ceramic glaze layer is 10 to 20 microns.

[0018] Another aspect of the present invention is to provide a cooking utensil having a magnetic conductive functional coating, wherein the cooking utensil is prepared by the above-mentioned method for preparing a cooking utensil having a magnetic conductive functional coating.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The cooking utensil with a magnetic conductive coating solves the problem that the existing cooking utensil with an aluminum pot body has no magnetic conductivity or poor magnetic conductivity, and meets the requirement for long-term magnetic conductivity use of the cooking utensil. DETAILED DESCRIPTION

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations. Example 1

[0022] The preparation method of the cooking utensil with a magnetic conductive functional coating of this embodiment comprises the following steps:

[0023] Step S1: Magnetic conductive metal particles are uniformly dispersed in a toluene solvent to form a suspension, wherein the magnetic conductive metal particles account for 10% by mass of the suspension. Vinylferrocene, an acrylate, and an epoxy olefin compound are then added, with the molar ratio of the vinylferrocene, acrylate, and epoxy olefin compound being 1:2:1, and the mass ratio of the magnetic conductive metal particles to the vinylferrocene being 3:1. An appropriate amount of diisopropyl peroxydicarbonate (DIC) is then added, and the mixture is reacted in an inert atmosphere at 50°C with ultrasonic-assisted stirring for 8 hours to form a core-shell magnetic conductive material having a core layer of magnetic conductive metal particles and a shell layer of a ferrocene-olefin copolymer. The magnetic conductive metal particles are selected from iron powder. The acrylate is a combination of methyl acrylate and a fluorinated acrylate, with the molar ratio of methyl acrylate to fluorinated acrylate being 1:1. The fluorinated acrylate is trifluoroethyl methacrylate. The epoxy olefin compound is 2,3-epoxypropyl acrylate.

[0024] Step S2: The core-shell magnetic conductive material obtained in step S1 is sprayed onto the outer surface of the pretreated aluminum pot body by atomization; the sprayed core-shell magnetic conductive material is baked at 120° C. for 10 minutes to form a magnetic conductive layer on the outer surface of the pot body; the atomization spraying is carried out at an atomization pressure of 0.2 MPa; the thickness of the magnetic conductive layer is 80 microns.

[0025] Step S3: A ceramic glaze layer is attached to the magnetic conductive layer obtained in step S2 to obtain the cooking utensil with a magnetic conductive coating. The ceramic glaze layer has a thickness of 20 microns. In this embodiment, the ceramic glaze layer is composed of the following raw materials in parts by weight: 58 parts silicon dioxide, 10 parts aluminum oxide, 15 parts calcium oxide, 12 parts sodium oxide, and 5 parts lead oxide.

[0026] The pretreatment method of the pot body is: placing the aluminum pot body in a sandblasting machine, using silicon carbide ceramic as shot blasting, and performing sandblasting roughening treatment to form an uneven raised structure on the outer surface of the bottom of the pot body, and then degreasing and cleaning it for standby use.

[0027] The cooking utensils prepared in Example 1 were tested on an induction cooker. The results showed low and even resistance distribution, and a stable heating power of 1600 watts. Furthermore, the cookware was subjected to aging resistance testing in a high-voltage accelerated aging chamber at 85°C and 85% relative humidity for 168 hours. The results showed that the heating power remained stable at 1600 watts, with no cracking, peeling, or shedding of the coating observed. Example 2

[0028] The preparation method of the cooking utensil with a magnetic conductive functional coating of this embodiment comprises the following steps:

[0029] Step S1: Magnetic conductive metal particles are uniformly dispersed in a toluene solvent to form a suspension, wherein the magnetic conductive metal particles account for 10% by mass of the suspension. Vinylferrocene, an acrylate, and an epoxy olefin compound are then added, with the molar ratio of the vinylferrocene, acrylate, and epoxy olefin compound being 2:5:1, and the mass ratio of the magnetic conductive metal particles to the vinylferrocene being 4:1. An appropriate amount of diethylhexyl peroxydicarbonate (DIC) is then added, and the mixture is reacted in an inert atmosphere at 50°C with ultrasonic-assisted stirring for 12 hours to form a core-shell magnetic conductive material having a core layer of magnetic conductive metal particles and a shell layer of a ferrocene-olefin copolymer. The magnetic conductive metal particles are selected from iron powder. The acrylate is a combination of methyl acrylate and a fluorinated acrylate, with the molar ratio of methyl acrylate to fluorinated acrylate being 3:2. The fluorinated acrylate is trifluoroethyl acrylate. The epoxy olefin compound is 1,2-epoxy-5-hexene.

[0030] Step S2: The core-shell magnetic conductive material obtained in step S1 is sprayed onto the outer surface of the pretreated aluminum pot body by atomization; the sprayed core-shell magnetic conductive material is baked at 90°C for 15 minutes to form a magnetic conductive layer on the outer surface of the pot body; the atomization spraying is carried out at an atomization pressure of 0.2 MPa; the thickness of the magnetic conductive layer is 100 microns.

[0031] Step S3: A ceramic glaze layer is attached to the magnetic conductive layer obtained in step S2 to obtain the cooking utensil with the magnetic conductive coating. The thickness of the ceramic glaze layer is 10 microns. The raw material composition of the ceramic glaze layer in this embodiment is the same as that in Example 1.

[0032] The pretreatment method of the pot body is the same as that of Example 1.

[0033] The cooking utensils prepared in Example 1 were tested on an induction cooker. The results showed low and even resistance distribution, and a stable heating power of 1600 watts. Furthermore, the cookware was subjected to aging resistance testing in a high-voltage accelerated aging chamber at 85°C and 85% relative humidity for 168 hours. The results showed that the heating power remained stable at 1600 watts, with no cracking, peeling, or shedding of the coating observed. Example 3

[0034] The preparation method of the cooking utensil with a magnetic conductive functional coating of this embodiment comprises the following steps:

[0035] Step S1: Disperse magnetic metal particles uniformly in toluene solvent to obtain a suspension, wherein the magnetic metal particles account for 10% by mass of the suspension. Then, vinyl ferrocene, acrylate, and epoxy olefin compound are added, wherein the molar ratio of vinyl ferrocene, acrylate, and epoxy olefin compound is 2:4:1, and the mass ratio of the magnetic metal particles to vinyl ferrocene is 5:1. An appropriate amount of azobisisobutyronitrile (ABI) initiator is added, and the mixture is reacted in an inert atmosphere at 50°C with ultrasonic-assisted stirring for 12 hours to obtain a core-shell magnetic material having a core layer of magnetic metal particles and a shell layer of ferrocene-olefin copolymer. The magnetic metal particles are selected from iron powder or an iron-carbon alloy. The acrylate is a combination of methyl acrylate and a fluorinated acrylate, wherein the molar ratio of methyl acrylate to fluorinated acrylate is 2:3. The fluorinated acrylate is trifluoromethyl methacrylate. The epoxy olefin compound is 4-(2-oxiranylmethoxy)butyl acrylate.

[0036] Step S2: The core-shell magnetic conductive material obtained in step S1 is sprayed onto the outer surface of the pretreated aluminum pot body by atomization; the sprayed core-shell magnetic conductive material is baked at a temperature of 110° C. for 20 minutes to form a magnetic conductive layer on the outer surface of the pot body; the atomization spraying is carried out at an atomization pressure of 0.2 MPa; the thickness of the magnetic conductive layer is 90 microns.

[0037] Step S3: A ceramic glaze layer is attached to the magnetic conductive layer obtained in step S2 to obtain the cooking utensil with the magnetic conductive coating. The ceramic glaze layer has a thickness of 20 microns. The raw material composition of the ceramic glaze layer in this embodiment is the same as that in Example 1.

[0038] The pretreatment method of the pot body is the same as that of Example 1.

[0039] The cooking utensils prepared in Example 1 were tested on an induction cooker. The results showed low and even resistance distribution, and a stable heating power of 1600 watts. Furthermore, the cookware was subjected to aging resistance testing in a high-voltage accelerated aging chamber at 85°C and 85% relative humidity for 168 hours. The results showed that the heating power remained stable at 1600 watts, with no cracking, peeling, or shedding of the coating observed. Example 4

[0040] The preparation method of the cooking utensil with a magnetic conductive functional coating of this embodiment has the same preparation steps as those of Example 1, except that, in the preparation method of the cooking utensil of this embodiment, iron-carbon alloy is used instead of iron powder in step S1, trifluoroethyl acrylate is used instead of trifluoroethyl methacrylate, and 1,2-epoxy-5-hexene is used instead of 2,3-epoxypropyl acrylate. Example 5

[0041] The preparation method of the cooking utensil having a magnetic conductive functional coating of this embodiment has the same preparation steps as those of Example 1, except that, in the preparation method of the cooking utensil of this embodiment, iron-aluminum alloy is used instead of iron powder in step S1, trifluoromethyl methacrylate is used instead of trifluoroethyl methacrylate, and 4-(2-oxiranylmethoxy)butyl acrylate is used instead of 2,3-epoxypropyl acrylate. Example 6

[0042] The preparation method of the cooking utensil having a magnetic conductive functional coating of this embodiment has the same preparation steps as those of Example 1, except that, in the preparation method of the cooking utensil of this embodiment, iron-manganese alloy is used instead of iron powder in step S1, trifluoromethyl methacrylate is used instead of trifluoroethyl methacrylate, and oxirane-2-yl methyl methacrylate is used instead of 2,3-epoxypropyl acrylate.

[0043] The cooking utensils prepared in Examples 3 to 6 were also tested on an induction cooker. The results showed that they all had low and evenly distributed resistance, and could achieve a stable heating power of 1600 watts. Furthermore, they were subjected to aging resistance testing in a high-voltage accelerated aging chamber at 85°C and 85% relative humidity for 168 hours. The results showed that the heating power remained stable at 1600 watts, and no cracking, peeling, or shedding of the coating was observed.

[0044] It can be seen that the present invention has considerable advantages over the currently used technologies. The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention claimed.

Claims

1. A method for preparing cooking utensils with a magnetic conductive coating, characterized in that: The preparation method comprises the following steps: S1: uniformly dispersing magnetic conductive metal particles in a solvent to obtain a suspension; then adding vinyl ferrocene, acrylate, and epoxy olefin compound, and then adding an initiator, and reacting with ultrasonic-assisted stirring in an inert atmosphere to obtain a core-shell magnetic conductive material having a core layer of magnetic conductive metal particles and a shell layer of ferrocene olefin copolymer; S2: spraying the core-shell magnetic conductive material obtained in step S1 onto the outer surface of the pretreated aluminum pot; baking the sprayed core-shell magnetic conductive material to form a magnetic conductive layer on the outer surface of the pot; S3: A ceramic glaze layer is attached to the magnetic conductive layer obtained in step S2 to obtain the cooking utensil with the magnetic conductive functional coating.

2. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, characterized in that: The magnetic conductive metal particles are selected from at least one of iron powder, iron-carbon alloy, iron-manganese alloy, iron-silicon alloy, iron-aluminum alloy, and iron-nickel alloy.

3. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The acrylate is a composition of methyl acrylate and fluorine-containing acrylate.

4. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 3, characterized in that: The fluorine-containing acrylate is at least one of trifluoroethyl methacrylate, trifluoroethyl acrylate, and trifluoromethyl methacrylate.

5. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The epoxy olefin compound is at least one of 2,3-epoxypropyl acrylate, 1,2-epoxy-5-hexene, 4-(2-oxiranylmethoxy)butyl acrylate, and oxiran-2-yl methyl methacrylate.

6. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The initiator is at least one of diisopropyl peroxydicarbonate, diethylhexyl peroxydicarbonate, azobisisobutyronitrile and azobisisoheptylonitrile.

7. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The molar ratio of the vinyl ferrocene, the acrylate and the epoxy olefin compound is 1-2:2-5:

1.

8. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The mass ratio of the magnetic conductive metal particles to vinylferrocene is 3 to 5:

1.

9. The method for preparing cooking utensils with a magnetic conductive functional coating according to claim 1, wherein: The pretreatment method of the pot body is: placing the aluminum pot body in a sandblasting machine, using silicon carbide ceramic as shot blasting, and performing sandblasting roughening treatment to form an uneven raised structure on the outer surface of the bottom of the pot body, and then degreasing and cleaning it for standby use.

10. A cooking utensil with a magnetic conductive coating, characterized in that: The cooking utensil is prepared by the method for preparing the cooking utensil with a magnetic conductive functional coating according to any one of claims 1 to 9.